我正在尝试使用vw为分类问题构建模型，问题是当我运行此代码来获取预测时：
vw -t -i model.vw -p predictions.txt test.txt
将predictions.txt写入文件系统需要很长时间（对于具有1000万个样本的测试，大约需要50分钟）;我认为使用SSD磁盘驱动器而不是磁盘驱动器可以加快这个过程，但它没有太大的区别，我也尝试了不同的文件系统（NTFS，XFS和EXT4），它也没有太大帮助;我认为vw可以选择在写出来之前缓冲输出，但我找不到它。
有关此问题的任何建议吗？
其他信息：
vw版本是在Debian 9 AMD64上从源代码（当然是来自Github.com repo）构建的8.5.0。读/写是在NTFS作为其文件系统的分区上完成的（在磁盘上）。 cat写入此分区上的文件的吞吐量在20MB到30MB之间。
当我开始vw时，它会产生另一个稍慢的子进程。
一般流程状态信息：
PID PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
3943 20 0 1131M 85728 6196 S 73.3 1.7 9:32.03 ├─ vw -t -i models/model.vw.30 -p x.txt
3944 20 0 1131M 85728 6196 R 36.3 1.7 4:53.39 │ └─ vw
父进程的示例strace输出：
Trace of process 3943 - vw -t -i models/model.vw.30 -p x.txt
strace: Process 3943 attached
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.131190\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.149736\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.287871\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.133941\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.141326\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.107144\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 1
write(4, "0.395839\n", 9) = 9
futex(0x561432250dfc, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x561432250df8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
子进程的示例strace输出：
Trace of process 3944 - vw
strace: Process 3944 attached
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046163, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046165, NULL) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046167, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046169, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046171, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046173, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
read(0, "1 |a x:5646322 |b 5646322 |c uBy"..., 5977) = 5977
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046175, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
read(0, "23:25.0 I24:25.0 I25:23.0 I26:25"..., 64944) = 56380
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046177, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046179, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046181, NULL) = 0
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x561432250dfc, FUTEX_WAIT_PRIVATE, 5046183, NULL) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x561432250da0, FUTEX_WAKE_PRIVATE, 1) = 0